157 



Ribes gracile jMichx. Hanover and Havana areas, in the mixed 

 forest association, occasional in the dune thickets and the black oak 

 forest, or along fence-rows on the prairie. 



Rosaceae 



Spiraea salicifolia L. Dixon area, in the Solidago association. 



Pyrus ioensis (Wood) Bailey. Hanover area, in the dune thickets. 



Pyriis Mains L. Hanover area, in the blowout thicket association. 



Pyrus americana (Marsh.) DC. Winnebago area, in the black 

 oak association. 



Fmgaria virginiana Duchesne, var. illinoensis (Prince) Gray. 

 Winnebago and Amboy areas, in the black oak association and as a 

 relic in the bur oak association; Hanover area, in the mixed forest. 



Fragaria vesca L., var. auiericana Porter. Winnebago area, in 

 the bur oak association ; Hanover area, on the perched dunes. 



Potent ilia argiita Pursh. Winnebago and Amboy areas, in the 

 black oak association and along- roadsides. 



Potentilla argcntea L. Winnebago area, in a pastured field. 



Potcntilla canadensis L. Winnebago area, in the black oak asso- 

 ciation. 



Geuui canadense Jacq. Hanover area, in the mixed forest asso- 

 ciation. 



Rubus idaeiis L., var. aculeatissimus (C. A. Mey.) Kegel & Til- 

 ing. Hanover area, in the mixed forest association ; Winnebago 

 area, in the bur oak association. 



Rubns occidentalis L. Hanover area, in the black oak and mixed 

 forest associations and on the perched dunes ; Winnebago area, in 

 the black oak and bur oak associations. 



Rubus sp. (Blackberry). Amboy area, in the bur oak association. 



Agrimonia mollis (T. & G.) Britton. Winnebago and Amboy 

 areas, in the bur oak association ; Havana area, in the mixed for- 

 est association. 



Rosa hmnilis Marsh. Hanover area, in the black oak and blow- 

 out thicket associations ; Winnebago area, in the black oak forest 

 and as a relic in the bur oak association ; Dixon area, in the bunch- 

 grass association. 



Prunus serotina Ehrh. Hanover area, in the dune thickets; 

 Winnebago area, in the bur oak association and as a pioneer in the 

 black oak forest ; Havana area, in the mixed forest association. 



Prmms virginiana L. Hanover area, in the mixed forest and 



